Spring-tooth harrow



W.,E. SMITH. SPRING TOOTH HARROW.

(No Model.)

Patente-d July 3, 1894.

@uhm/zoom n UNITED` STATES PATENT OFFICE.

lWILLIAM E. SMITH, OF `WATKINS, NEW YORK.

SPRING-TOOTH 'HARROW.

sPEcIFicATIoN forming part of Letters Patent No. 522,435, aateaJuly s,1894. Application tiled September 22, 1892*. Renewed January 18, 1894.SerialNo. 49'7,332. (No model.)

To all whom it may concern:

Be it known that I, WILLIAM E. SMITH, a citizen of the United States,residing at Watkins, Schuyler county, vNew York, have invented certainnew and useful'lmprovements in Spring-Tooth Harrows, ot' which thefollowing is a specification.

My invention relates to spring tooth harrows, and it has for its objectto provide means whereby the spring teeth may be adj ustably andsecurely held in position in connection with the frame of the harrow,and to these ends my invention consists in the features of construction,arrangement, and mode yof operation substantially as herein set forth.

Referring to the accompanying drawings, Figure 1, is a perspective viewof a harrow embodying my invention. Fig. 2, is an enlarged perspectiveview of one of the harrow teeth, and means for holding it, the partsbeing detached. Fig. 3,is an enlarged sectional view through the holderand harrow tooth.

I have shown my invention as applied to one form of harrow 'frame inwhich the frame is made upy of a series of strips or straps A, bent inzig-zag form, and having flat portions a by means'of which they may besecured together, and in the present instance I have shown the stripsjorstraps held by the same bolts that secure the tooth holder in position.The frame may be of any size, shape or design, and preferablyis made oftwo wings or parts hinged together, as at a', while the outer sides areprovided withstrengthening strips A. These strips or straps may be madeof wrought iron or other suitable material, and can be forged orotherwise bent in the form desired.

The tooth holder proper consists of a hub or yoke B, Awhich may be madeof cast metal or otherwise, and which is provided with a cylindricalopening B', and the under side is provided with lugs or ribs b, b'projecting inwardly, and adapted to receive the tooth T, which is shownas being made ot spring metal, preferably having a pointed end T'. Thehub also has an opening B2, through the bottom between the ribs b, b' tothe cylindrical opening, and the ribs are so arranged that r5c when thetooth is in position, it will extend slightly into the opening B', asclearly shown in Fig. 3. y t,

AArranged to support the holder and the parts of the frame is aconnector C, and this connector consists essentially of a hollow tubeC', of a diameter considerably smaller than the opening B' in the hub,and of a length suflcient to extend through the yoke. Mounted on, orconnected to this tube is a disk D, and this disk is preferably providedwith ribs d, on its outer face, the ribs extending parallel across theface and at a distance apart suflicient to receive the frame A. Anotherdisk D', which is preferably separate from the tube, is also providedwith ribs d', on its outer face to receive the adjacent portion of theframe, and its inner face is recessed as at d2 to tit over the end ofthe tube C', and to allow the disk to be clamped against the face of thehub. These parts may be secured together by any suitable means and I,have shown a bolt E, arranged to pass through the opening e, in thedisk D', through the tube C', and the opening e' in the disk D, andthrough corresponding openings in the parts of the frame A.

It will thus be seenthat when the parts are in the position shown inFig. 3, and the screw is tightened, the hub B is clamped by the disk,and furthermore, the parts of the frame yA are also clamped and held inposition by inder and the ribs of the hub, and I have shown a screw F,passing through an opening in the top of the hub, and bearing on theface of the cylinder C, and forcing the cylinder on to the upper face ofthe tooth, clamping it securely in position. Not only does this securethe tooth in the hub, but also prevents the hub rotating on thecylinder,'and adds to the friction of the disk in maintaining the hub inits proper position.

It will be seen that with this device if it is desired to adjust atooth, it is only necessary ICC to loosen the screw F, when the toothcan be slipped in or out of its socket, and again secured by tighteningthe screw. Further it will be seen that if the positions of the toothand hub are to be adjusted without changing the position of the tooth inthe hub, it is only necessary to loosen the bolt E, when the tooth andhub can be adjusted to any desired angle and again secured.

All the parts of my device can be cheaply and easily made of strong anddurable material, and quickly and easily adjusted for any desiredpurpose, and the harrow can readily be taken apart, or put together, andthe Whole forms a simple and eilect-ive device for the purposespecified.

It will be understood that while I have shown the preferred embodimentof my invention, the details of construction may be varied withoutdeparting from the spirit of my invention, and I do not limit myself tothe exact details shown.

What I claim is- 1. The combination of the hub and spring tooth mountedtherein, of the cylinder mounted in the hub, and means for pressing thecylinder on to the tooth to secure it in position, substantially asdescribed.

2. The combination with the hub having ribs forming a recess for thereception of the tooth, and having an opening therethrough, of acylinder fitting the opening loosely and bearing on the tooth, and meansfor pressing the cylinder in position, substantially as described,

